halfords also have a similar booster seat for £5. Its not on promotion or a glitch just normal price. However, the seat at Halfords does look as though its made of better material/quality

I hve both...I recommend the halfords one as it is made of hard plastic. The lidi one is ok but is polystrene - I get the feeling the arms will break over time - the good thing about the lidi one is it is a bit bigger so sits a bit higher.